I had something worse happen before... you know the thick plastic clam shells that some things you buy are in? That take several sharp knives and extreme muscles and dexterity to get the product out of? I was running a register one day and was taking an alarm thingie off of it. in order for the alarm thingie to fit around it, we had to cut slices in each quarter of the area. As I was taking it off, the thick plastic PINCHED the crap out of my nipple and HELD ON for a second. My customer was a man and I had to use every single ounce of inner strength not to drop the calculator, clutch my boob tightly, and yell FUCK! in his face.